Changes in the photosynthetic efficiency of winter wheat in response to abiotic stress

Balla, Krisztina and Bencze, Szilvia and Bónis, Péter and Árendás, Tamás and Veisz, Ottó Bálint (2014) Changes in the photosynthetic efficiency of winter wheat in response to abiotic stress. CENTRAL EUROPEAN JOURNAL OF BIOLOGY, 9 (5). pp. 519-530. ISSN 1895-104X


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The assessment of heat and drought tolerance is of primary importance in breeding programmes designed to improve heat and drought tolerance in cereals. Three winter wheat varieties grown in controlled growth chambers were exposed to heat (H) and drought (D) stress singly and in combination (H+D). The combined effects of H and D stress were much more severe than those of individual treatments for both physiological and yield parameters during grain filling. The chlorophyll content, effective quantum yield of PSII, net assimilation rate, transpiration, stomatal conductance and intercellular CO2 concentration were greatly reduced by H, D and their interaction. Grain yield decreased to a greater extent (48.3%) in Plainsman V, averaged over the stress treatments, than in Mv Magma (67.8%) and Fatima 2 (53.7%). The least decline was found in grain number, except in Plainsman V. Mv Magma tolerated heat stress better than Fatima 2. In terms of photosynthetic activity, Plainsman V showed better drought tolerance than Mv Magma. The results showed that changes in physiological properties during stress treatment are not always associated with changes in yield parameters, so a combination of methods may be needed to give a more precise picture of the stress tolerance of wheat varieties.

Item Type: Article
Uncontrolled Keywords: Winter wheat; PHOTOSYNTHESIS; Heat stress; Grain yield; Grain filling; drought
Subjects: Q Science / természettudomány > QK Botany / növénytan
S Agriculture / mezőgazdaság > SB Plant culture / növénytermesztés
Depositing User: MTMT SWORD
Date Deposited: 05 Mar 2014 14:28
Last Modified: 05 Mar 2015 00:15

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